Can't get Express to join established Extreme network

My Extreme base works fine connected via ethernet to an eMac without an AirPort card. My roaming MacBook finds the network, and everything is just swell. Both computers are running 10.4.10. THE PROBLEM OCCURS when I try to set up a wireless delivery system with an Express. I want to extend the reach of my network and use the Express to play my iTunes library on the eMac.
Naturally, I can't set up the Express with the eMac, since the eMac lacks the card. So I use the AirPort Utility on the MacBook. After I reset the Express, the Utility sees both the Extreme and the Express. I proceed to configure the Express, following the steps in the Utility, and it tells me I've done it correctly--though curiously, the Express icon vanishes at the end of the process.
Then things get worse. Both bases have green lights. But the network falls apart. Even though my Internet Connection on my MacBook says I'm on the network, I can't get online ("server not found" error message). And now the AirPort Utility on my MacBook doesn't see the Extreme, only the Express. After quitting the Utility and restarting it--both bases still have green lights--I then can see NEITHER base. (Finally unplugged the Express and reconfigured the Extreme with the AirPort Utility on the eMac to get things back to normal.)
Sorry that was so long. Wanted to be as detailed as possible. Any suggestions?

Wide,
I have a very similar problem as well. I set up a WDS using my Extreme (N) and an Express in a similar fashion to what you are describing. When my iMac (10.4.10) is in the vicinity of the Extreme, it connects without difficulty. The problem arises when I attempt to connect the same iMac using the extended network Express. The iMac sees the network, has a good signal, but cannot connect to the internet. Again, both the Extreme and Express have a green light and are configured properly for a WDS.
Very frustrating,
Jerol

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